Click here to purchase the entire book in PDF format. Inductors in Series and Parallel Finding the total inductance of a number of inductors connected in series or parallel behave the same way as resistors. If the inductors are connected in series, then you add the individual inductances as in Equation 2.91. $$L_{total} = L_{1} + L_{2} + L_{3} + \cdots + L_{n}$$ (3.91) If the inductors are connected in parallel, then you use Equation 2.92. $$L_{total} = \frac{1}{\frac{1}{L_{1}} + \frac{1}{L_{2}} + \frac{1}{L_{3}} + \cdots + \frac{1}{L_{n}}}$$ (3.92)